Capt Dave,
Looks like I'll have to put on a hat to sneek into westwhatever and take a look at this wonderous dough. Didn't get what you meant about the splash zone and the stain. So what is it, a sandable watermix fixall? It is the minor filling stuff that sands to dust but fills every imperfection - that I'm looking for.

Recall a large tube of one part 3M made years ago. It sanded absolutely S m o o o t h.

My problem with paint fillers is that I think they are too soft to put on the topsides. I mean the hull sides. It's a hard life out there